html,
body,
div,
h2 {
    margin: 0;
    padding: 0;
}

#app {
    padding: 20px;
    border: 1px solid #ddd;
    border-radius: 20px;
    background: darkkhaki;
    margin: 50px;
}

#app h2 {
    color: darkcyan;
    font-size: 40px;
    font-weight: 100;
}